WALL CONDITIONING WITH IMPURITY PELLET INJECTION ON TFTR

被引:70
作者
SNIPES, JA
MARMAR, ES
TERRY, JL
BELL, MG
BUDNY, RV
HILL, KW
JASSBY, DL
MANSFIELD, DK
MEADE, DM
PARK, HK
STRACHAN, JD
STRATTON, BC
SYNAKOWSKI, EJ
TAYLOR, G
RUZIC, DN
SHAHEEN, M
机构
[1] PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543
[2] UNIV ILLINOIS,DEPT NUCL ENGN,URBANA,IL 61801
关键词
D O I
10.1016/S0022-3115(06)80123-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Solid lithium and boron pellets have been injected into TFTR plasmas to improve plasma performance by coating the graphite inner wall bumper limiter with a small amount of lower Z pellet material, which reduces the influx of carbon from the walls and reduces the edge electron density. This new wall conditioning technique has been applied successfully when continued He conditioning discharges, which are normally used for wall conditioning, no longer significantly reduce the carbon and deuterium influxes. The results show that both Li and B pellets significantly improve wall conditioning and lead to 15-20% improvements in supershot plasma performance when injected greater-than-or-equal-to 1 s prior to neutral beam injection in supershot target plasmas. Neutral beam penetration calculations indicate that the lower edge densities resulting from Li or B pellet wall conditioning lead to improved beam penetration. Sputtering yield calculations confirm that the addition of small amounts of Li on a graphite target can significantly reduce the C sputtering yield.
引用
收藏
页码:686 / 691
页数:6
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